不好意思,漏掉了那行。
具体命令如下,我发现得到的输出前两行对应的就是0xb77b9416(即__kernel_vsyscall),然后试着删掉这两行再去生成火焰图,发现没问题了。去掉那两行,得出的火焰图附件所示。:)
不过这样也就意味着我每次都要先删掉这两行才能生成可用的火焰图了。。。
real@real:~/working_copy/nginx-systemtap-toolkit$ sudo perl ngx-sample-bt -p 17840 -t 10 -u
[sudo] password for real:
WARNING: missing unwind/symbol data for module 'kernel'
WARNING: Tracing 17840 (/usr/local/nginx/sbin/nginx) in user-space only...
WARNING: Time's up. Quitting now...(it may take a while)
0xb77b9416 : 0xb77b9416
1306
0xb74e7bd0 : getaliasbyname_r+0x4680/0x1b970 [/lib/i386-linux-gnu/libc-2.15.so]
0x804c611 : ngx_pcalloc+0x39/0x47 [/usr/local/nginx/sbin/nginx]
0x80755bb : ngx_http_init_request+0x107/0x41e [/usr/local/nginx/sbin/nginx]
0x8075a5f : ngx_http_keepalive_handler+0x18d/0x1a1 [/usr/local/nginx/sbin/nginx]
0x80615fe : ngx_event_process_posted+0x8e/0x9a [/usr/local/nginx/sbin/nginx]
0x806112b : ngx_process_events_and_timers+0x163/0x177 [/usr/local/nginx/sbin/nginx]
0x80687c5 : ngx_worker_process_cycle+0xdc/0x1ca [/usr/local/nginx/sbin/nginx]
0x8066eba : ngx_spawn_process+0x4d3/0x5e5 [/usr/local/nginx/sbin/nginx]
0x8067d18 : ngx_start_worker_processes+0x7d/0xba [/usr/local/nginx/sbin/nginx]
0x80690e1 : ngx_master_process_cycle+0x1e9/0xab9 [/usr/local/nginx/sbin/nginx]
0x804b413 : main+0xa8e/0xad7 [/usr/local/nginx/sbin/nginx]
0xb73cc4d3 : __libc_start_main+0xf3/0x210 [/lib/i386-linux-gnu/libc-2.15.so]
0x804a121 : _start+0x21/0x30 [/usr/local/nginx/sbin/nginx]
80
0xb74e7bd0 : getaliasbyname_r+0x4680/0x1b970 [/lib/i386-linux-gnu/libc-2.15.so]
0x804c611 : ngx_pcalloc+0x39/0x47 [/usr/local/nginx/sbin/nginx]
0x808b347 : ngx_http_static_handler+0x48b/0x5e4 [/usr/local/nginx/sbin/nginx]
0x8072637 : ngx_http_core_content_phase+0x76/0x16f [/usr/local/nginx/sbin/nginx]
0x806dad3 : ngx_http_core_run_phases+0x23/0x3f [/usr/local/nginx/sbin/nginx]
0x806dbd2 : ngx_http_handler+0xe3/0xe8 [/usr/local/nginx/sbin/nginx]
0x80732fa : ngx_http_internal_redirect+0x174/0x180 [/usr/local/nginx/sbin/nginx]
0x808c003 : ngx_http_index_handler+0x7ea/0x83b [/usr/local/nginx/sbin/nginx]
0x8072637 : ngx_http_core_content_phase+0x76/0x16f [/usr/local/nginx/sbin/nginx]
0x806dad3 : ngx_http_core_run_phases+0x23/0x3f [/usr/local/nginx/sbin/nginx]
0x806dbd2 : ngx_http_handler+0xe3/0xe8 [/usr/local/nginx/sbin/nginx]
0x80784a9 : ngx_http_process_request+0xea/0x102 [/usr/local/nginx/sbin/nginx]
0x8078b4a : ngx_http_process_request_headers+0x689/0x691 [/usr/local/nginx/sbin/nginx]
0x80790f9 : ngx_http_process_request_line+0x5a7/0x5af [/usr/local/nginx/sbin/nginx]
0x80758ca : ngx_http_init_request+0x416/0x41e [/usr/local/nginx/sbin/nginx]
0x8075a5f : ngx_http_keepalive_handler+0x18d/0x1a1 [/usr/local/nginx/sbin/nginx]
0x80615fe : ngx_event_process_posted+0x8e/0x9a [/usr/local/nginx/sbin/nginx]
0x806112b : ngx_process_events_and_timers+0x163/0x177 [/usr/local/nginx/sbin/nginx]
0x80687c5 : ngx_worker_process_cycle+0xdc/0x1ca [/usr/local/nginx/sbin/nginx]
0x8066eba : ngx_spawn_process+0x4d3/0x5e5 [/usr/local/nginx/sbin/nginx]
0x8067d18 : ngx_start_worker_processes+0x7d/0xba [/usr/local/nginx/sbin/nginx]
0x80690e1 : ngx_master_process_cycle+0x1e9/0xab9 [/usr/local/nginx/sbin/nginx]
0x804b413 : main+0xa8e/0xad7 [/usr/local/nginx/sbin/nginx]
0xb73cc4d3 : __libc_start_main+0xf3/0x210 [/lib/i386-linux-gnu/libc-2.15.so]
0x804a121 : _start+0x21/0x30 [/usr/local/nginx/sbin/nginx]
2
0xb74e7bd0 : getaliasbyname_r+0x4680/0x1b970 [/lib/i386-linux-gnu/libc-2.15.so]
0x804c611 : ngx_pcalloc+0x39/0x47 [/usr/local/nginx/sbin/nginx]
0x80755bb : ngx_http_init_request+0x107/0x41e [/usr/local/nginx/sbin/nginx]
0x806a1dd : ngx_epoll_process_events+0x34a/0x490 [/usr/local/nginx/sbin/nginx]
0x8061062 : ngx_process_events_and_timers+0x9a/0x177 [/usr/local/nginx/sbin/nginx]
0x80687c5 : ngx_worker_process_cycle+0xdc/0x1ca [/usr/local/nginx/sbin/nginx]
0x8066eba : ngx_spawn_process+0x4d3/0x5e5 [/usr/local/nginx/sbin/nginx]
0x8067d18 : ngx_start_worker_processes+0x7d/0xba [/usr/local/nginx/sbin/nginx]
0x80690e1 : ngx_master_process_cycle+0x1e9/0xab9 [/usr/local/nginx/sbin/nginx]
0x804b413 : main+0xa8e/0xad7 [/usr/local/nginx/sbin/nginx]
0xb73cc4d3 : __libc_start_main+0xf3/0x210 [/lib/i386-linux-gnu/libc-2.15.so]
0x804a121 : _start+0x21/0x30 [/usr/local/nginx/sbin/nginx]
2
0x806adbb : ngx_linux_sendfile_chain+0x65b/0xa6c [/usr/local/nginx/sbin/nginx]
0x807c011 : ngx_http_write_filter+0x851/0xcd0 [/usr/local/nginx/sbin/nginx]
0x808c0b4 : ngx_http_chunked_body_filter+0x32/0x302 [/usr/local/nginx/sbin/nginx]
0x8091bdb : ngx_http_gzip_body_filter+0x38/0x9d9 [/usr/local/nginx/sbin/nginx]
0x8092b06 : ngx_http_postpone_filter+0xb5/0x1ff [/usr/local/nginx/sbin/nginx]
0x8094a41 : ngx_http_ssi_body_filter+0x5b/0x1b29 [/usr/local/nginx/sbin/nginx]
0x80979c4 : ngx_http_charset_body_filter+0x42/0xa49 [/usr/local/nginx/sbin/nginx]
0x804e195 : ngx_output_chain+0xa5/0x877 [/usr/local/nginx/sbin/nginx]
0x807c684 : ngx_http_copy_filter+0x182/0x20e [/usr/local/nginx/sbin/nginx]
0x808c4ce : ngx_http_range_body_filter+0x4a/0x698 [/usr/local/nginx/sbin/nginx]
0x80721d9 : ngx_http_output_filter+0x61/0x76 [/usr/local/nginx/sbin/nginx]
0x808b450 : ngx_http_static_handler+0x594/0x5e4 [/usr/local/nginx/sbin/nginx]
0x8072637 : ngx_http_core_content_phase+0x76/0x16f [/usr/local/nginx/sbin/nginx]
0x806dad3 : ngx_http_core_run_phases+0x23/0x3f [/usr/local/nginx/sbin/nginx]
0x806dbd2 : ngx_http_handler+0xe3/0xe8 [/usr/local/nginx/sbin/nginx]
0x80732fa : ngx_http_internal_redirect+0x174/0x180 [/usr/local/nginx/sbin/nginx]
0x808c003 : ngx_http_index_handler+0x7ea/0x83b [/usr/local/nginx/sbin/nginx]
0x8072637 : ngx_http_core_content_phase+0x76/0x16f [/usr/local/nginx/sbin/nginx]
0x806dad3 : ngx_http_core_run_phases+0x23/0x3f [/usr/local/nginx/sbin/nginx]
0x806dbd2 : ngx_http_handler+0xe3/0xe8 [/usr/local/nginx/sbin/nginx]
0x80784a9 : ngx_http_process_request+0xea/0x102 [/usr/local/nginx/sbin/nginx]
0x8078b4a : ngx_http_process_request_headers+0x689/0x691 [/usr/local/nginx/sbin/nginx]
0x80790f9 : ngx_http_process_request_line+0x5a7/0x5af [/usr/local/nginx/sbin/nginx]
0x80758ca : ngx_http_init_request+0x416/0x41e [/usr/local/nginx/sbin/nginx]
0x8075a5f : ngx_http_keepalive_handler+0x18d/0x1a1 [/usr/local/nginx/sbin/nginx]
0x80615fe : ngx_event_process_posted+0x8e/0x9a [/usr/local/nginx/sbin/nginx]
0x806112b : ngx_process_events_and_timers+0x163/0x177 [/usr/local/nginx/sbin/nginx]
0x80687c5 : ngx_worker_process_cycle+0xdc/0x1ca [/usr/local/nginx/sbin/nginx]
0x8066eba : ngx_spawn_process+0x4d3/0x5e5 [/usr/local/nginx/sbin/nginx]
0x8067d18 : ngx_start_worker_processes+0x7d/0xba [/usr/local/nginx/sbin/nginx]
0x80690e1 : ngx_master_process_cycle+0x1e9/0xab9 [/usr/local/nginx/sbin/nginx]
0x804b413 : main+0xa8e/0xad7 [/usr/local/nginx/sbin/nginx]
0xb73cc4d3 : __libc_start_main+0xf3/0x210 [/lib/i386-linux-gnu/libc-2.15.so]
0x804a121 : _start+0x21/0x30 [/usr/local/nginx/sbin/nginx]
1
0x806b121 : ngx_linux_sendfile_chain+0x9c1/0xa6c [/usr/local/nginx/sbin/nginx]
0x807c011 : ngx_http_write_filter+0x851/0xcd0 [/usr/local/nginx/sbin/nginx]
0x808c0b4 : ngx_http_chunked_body_filter+0x32/0x302 [/usr/local/nginx/sbin/nginx]
0x8091bdb : ngx_http_gzip_body_filter+0x38/0x9d9 [/usr/local/nginx/sbin/nginx]
0x8092b06 : ngx_http_postpone_filter+0xb5/0x1ff [/usr/local/nginx/sbin/nginx]
0x8094a41 : ngx_http_ssi_body_filter+0x5b/0x1b29 [/usr/local/nginx/sbin/nginx]
0x80979c4 : ngx_http_charset_body_filter+0x42/0xa49 [/usr/local/nginx/sbin/nginx]
0x804e195 : ngx_output_chain+0xa5/0x877 [/usr/local/nginx/sbin/nginx]
0x807c684 : ngx_http_copy_filter+0x182/0x20e [/usr/local/nginx/sbin/nginx]
0x808c4ce : ngx_http_range_body_filter+0x4a/0x698 [/usr/local/nginx/sbin/nginx]
0x80721d9 : ngx_http_output_filter+0x61/0x76 [/usr/local/nginx/sbin/nginx]
0x808b450 : ngx_http_static_handler+0x594/0x5e4 [/usr/local/nginx/sbin/nginx]
0x8072637 : ngx_http_core_content_phase+0x76/0x16f [/usr/local/nginx/sbin/nginx]
0x806dad3 : ngx_http_core_run_phases+0x23/0x3f [/usr/local/nginx/sbin/nginx]
0x806dbd2 : ngx_http_handler+0xe3/0xe8 [/usr/local/nginx/sbin/nginx]
0x80732fa : ngx_http_internal_redirect+0x174/0x180 [/usr/local/nginx/sbin/nginx]
0x808c003 : ngx_http_index_handler+0x7ea/0x83b [/usr/local/nginx/sbin/nginx]
0x8072637 : ngx_http_core_content_phase+0x76/0x16f [/usr/local/nginx/sbin/nginx]
0x806dad3 : ngx_http_core_run_phases+0x23/0x3f [/usr/local/nginx/sbin/nginx]
0x806dbd2 : ngx_http_handler+0xe3/0xe8 [/usr/local/nginx/sbin/nginx]
0x80784a9 : ngx_http_process_request+0xea/0x102 [/usr/local/nginx/sbin/nginx]
0x8078b4a : ngx_http_process_request_headers+0x689/0x691 [/usr/local/nginx/sbin/nginx]
0x80790f9 : ngx_http_process_request_line+0x5a7/0x5af [/usr/local/nginx/sbin/nginx]
0x80758ca : ngx_http_init_request+0x416/0x41e [/usr/local/nginx/sbin/nginx]
0x8075a5f : ngx_http_keepalive_handler+0x18d/0x1a1 [/usr/local/nginx/sbin/nginx]
0x80615fe : ngx_event_process_posted+0x8e/0x9a [/usr/local/nginx/sbin/nginx]
0x806112b : ngx_process_events_and_timers+0x163/0x177 [/usr/local/nginx/sbin/nginx]
0x80687c5 : ngx_worker_process_cycle+0xdc/0x1ca [/usr/local/nginx/sbin/nginx]
0x8066eba : ngx_spawn_process+0x4d3/0x5e5 [/usr/local/nginx/sbin/nginx]
0x8067d18 : ngx_start_worker_processes+0x7d/0xba [/usr/local/nginx/sbin/nginx]
0x80690e1 : ngx_master_process_cycle+0x1e9/0xab9 [/usr/local/nginx/sbin/nginx]
0x804b413 : main+0xa8e/0xad7 [/usr/local/nginx/sbin/nginx]
0xb73cc4d3 : __libc_start_main+0xf3/0x210 [/lib/i386-linux-gnu/libc-2.15.so]
0x804a121 : _start+0x21/0x30 [/usr/local/nginx/sbin/nginx]
1
0xb74e7bd0 : getaliasbyname_r+0x4680/0x1b970 [/lib/i386-linux-gnu/libc-2.15.so]
0x804c611 : ngx_pcalloc+0x39/0x47 [/usr/local/nginx/sbin/nginx]
0x808b347 : ngx_http_static_handler+0x48b/0x5e4 [/usr/local/nginx/sbin/nginx]
0x8072637 : ngx_http_core_content_phase+0x76/0x16f [/usr/local/nginx/sbin/nginx]
0x806dad3 : ngx_http_core_run_phases+0x23/0x3f [/usr/local/nginx/sbin/nginx]
0x806dbd2 : ngx_http_handler+0xe3/0xe8 [/usr/local/nginx/sbin/nginx]
0x80732fa : ngx_http_internal_redirect+0x174/0x180 [/usr/local/nginx/sbin/nginx]
0x808c003 : ngx_http_index_handler+0x7ea/0x83b [/usr/local/nginx/sbin/nginx]
0x8072637 : ngx_http_core_content_phase+0x76/0x16f [/usr/local/nginx/sbin/nginx]
0x806dad3 : ngx_http_core_run_phases+0x23/0x3f [/usr/local/nginx/sbin/nginx]
0x806dbd2 : ngx_http_handler+0xe3/0xe8 [/usr/local/nginx/sbin/nginx]
0x80784a9 : ngx_http_process_request+0xea/0x102 [/usr/local/nginx/sbin/nginx]
0x8078b4a : ngx_http_process_request_headers+0x689/0x691 [/usr/local/nginx/sbin/nginx]
0x80790f9 : ngx_http_process_request_line+0x5a7/0x5af [/usr/local/nginx/sbin/nginx]
0x80758ca : ngx_http_init_request+0x416/0x41e [/usr/local/nginx/sbin/nginx]
0x806a1dd : ngx_epoll_process_events+0x34a/0x490 [/usr/local/nginx/sbin/nginx]
0x8061062 : ngx_process_events_and_timers+0x9a/0x177 [/usr/local/nginx/sbin/nginx]
0x80687c5 : ngx_worker_process_cycle+0xdc/0x1ca [/usr/local/nginx/sbin/nginx]
0x8066eba : ngx_spawn_process+0x4d3/0x5e5 [/usr/local/nginx/sbin/nginx]
0x8067d18 : ngx_start_worker_processes+0x7d/0xba [/usr/local/nginx/sbin/nginx]
0x80690e1 : ngx_master_process_cycle+0x1e9/0xab9 [/usr/local/nginx/sbin/nginx]
0x804b413 : main+0xa8e/0xad7 [/usr/local/nginx/sbin/nginx]
0xb73cc4d3 : __libc_start_main+0xf3/0x210 [/lib/i386-linux-gnu/libc-2.15.so]
0x804a121 : _start+0x21/0x30 [/usr/local/nginx/sbin/nginx]
1
0x804c2fe : ngx_destroy_pool+0x49/0xfc [/usr/local/nginx/sbin/nginx]
0x8074b6a : ngx_http_free_request+0x16a/0x172 [/usr/local/nginx/sbin/nginx]
0x80767ef : ngx_http_finalize_connection+0x46c/0xd05 [/usr/local/nginx/sbin/nginx]
0x8077649 : ngx_http_finalize_request+0x89/0x565 [/usr/local/nginx/sbin/nginx]
0x8072648 : ngx_http_core_content_phase+0x87/0x16f [/usr/local/nginx/sbin/nginx]
0x806dad3 : ngx_http_core_run_phases+0x23/0x3f [/usr/local/nginx/sbin/nginx]
0x806dbd2 : ngx_http_handler+0xe3/0xe8 [/usr/local/nginx/sbin/nginx]
0x80784a9 : ngx_http_process_request+0xea/0x102 [/usr/local/nginx/sbin/nginx]
0x8078b4a : ngx_http_process_request_headers+0x689/0x691 [/usr/local/nginx/sbin/nginx]
0x80790f9 : ngx_http_process_request_line+0x5a7/0x5af [/usr/local/nginx/sbin/nginx]
0x80758ca : ngx_http_init_request+0x416/0x41e [/usr/local/nginx/sbin/nginx]
0x8075a5f : ngx_http_keepalive_handler+0x18d/0x1a1 [/usr/local/nginx/sbin/nginx]
0x80615fe : ngx_event_process_posted+0x8e/0x9a [/usr/local/nginx/sbin/nginx]
0x806112b : ngx_process_events_and_timers+0x163/0x177 [/usr/local/nginx/sbin/nginx]
0x80687c5 : ngx_worker_process_cycle+0xdc/0x1ca [/usr/local/nginx/sbin/nginx]
0x8066eba : ngx_spawn_process+0x4d3/0x5e5 [/usr/local/nginx/sbin/nginx]
0x8067d18 : ngx_start_worker_processes+0x7d/0xba [/usr/local/nginx/sbin/nginx]
0x80690e1 : ngx_master_process_cycle+0x1e9/0xab9 [/usr/local/nginx/sbin/nginx]
0x804b413 : main+0xa8e/0xad7 [/usr/local/nginx/sbin/nginx]
0xb73cc4d3 : __libc_start_main+0xf3/0x210 [/lib/i386-linux-gnu/libc-2.15.so]
0x804a121 : _start+0x21/0x30 [/usr/local/nginx/sbin/nginx]
1
0x807f26e : ngx_http_variable_request_line+0x73/0xad [/usr/local/nginx/sbin/nginx]
0x80808c7 : ngx_http_get_indexed_variable+0x93/0xdd [/usr/local/nginx/sbin/nginx]
0x807ced3 : ngx_http_log_variable_getlen+0x18/0x60 [/usr/local/nginx/sbin/nginx]
0x807df94 : ngx_http_log_handler+0xe1/0x22d [/usr/local/nginx/sbin/nginx]
0x8074978 : ngx_http_log_request+0x3c/0x57 [/usr/local/nginx/sbin/nginx]
0x8074ab7 : ngx_http_free_request+0xb7/0x172 [/usr/local/nginx/sbin/nginx]
0x80767ef : ngx_http_finalize_connection+0x46c/0xd05 [/usr/local/nginx/sbin/nginx]
0x8077649 : ngx_http_finalize_request+0x89/0x565 [/usr/local/nginx/sbin/nginx]
0x8072648 : ngx_http_core_content_phase+0x87/0x16f [/usr/local/nginx/sbin/nginx]
0x806dad3 : ngx_http_core_run_phases+0x23/0x3f [/usr/local/nginx/sbin/nginx]
0x806dbd2 : ngx_http_handler+0xe3/0xe8 [/usr/local/nginx/sbin/nginx]
0x80784a9 : ngx_http_process_request+0xea/0x102 [/usr/local/nginx/sbin/nginx]
0x8078b4a : ngx_http_process_request_headers+0x689/0x691 [/usr/local/nginx/sbin/nginx]
0x80790f9 : ngx_http_process_request_line+0x5a7/0x5af [/usr/local/nginx/sbin/nginx]
0x80758ca : ngx_http_init_request+0x416/0x41e [/usr/local/nginx/sbin/nginx]
0x8075a5f : ngx_http_keepalive_handler+0x18d/0x1a1 [/usr/local/nginx/sbin/nginx]
0x80615fe : ngx_event_process_posted+0x8e/0x9a [/usr/local/nginx/sbin/nginx]
0x806112b : ngx_process_events_and_timers+0x163/0x177 [/usr/local/nginx/sbin/nginx]
0x80687c5 : ngx_worker_process_cycle+0xdc/0x1ca [/usr/local/nginx/sbin/nginx]
0x8066eba : ngx_spawn_process+0x4d3/0x5e5 [/usr/local/nginx/sbin/nginx]
0x8067d18 : ngx_start_worker_processes+0x7d/0xba [/usr/local/nginx/sbin/nginx]
0x80690e1 : ngx_master_process_cycle+0x1e9/0xab9 [/usr/local/nginx/sbin/nginx]
0x804b413 : main+0xa8e/0xad7 [/usr/local/nginx/sbin/nginx]
0xb73cc4d3 : __libc_start_main+0xf3/0x210 [/lib/i386-linux-gnu/libc-2.15.so]
0x804a121 : _start+0x21/0x30 [/usr/local/nginx/sbin/nginx]
1
在 2013年7月19日星期五UTC+8下午2时11分11秒,agentzh写道:
Hello!
从你提供的输出看,都很正常。不过我上封邮件还有一行貌似你遗漏掉了:
“你是如何调用 ngx-sample-bt 的?命令行贴出来看?另外,ngx-sample-bt 工具的输出也完整地贴出来看?”
关于推荐的 Linux 发行版,我推荐 RedHat 系的发行版,比如 Fedora. systemtap 就使用最新的发布或者快照版就成了 :)
Regards,
-agentzh
2013/7/18 微光 <hnlq...@gmail.com>:
> real@real:~/working_copy/nginx-systemtap-toolkit$ uname -r
> 3.5.0-23-generic
>
> real@real:~/working_copy/nginx-systemtap-toolkit$ grep CONFIG_UPROBES
> /boot/config-`uname -r`
> CONFIG_UPROBES=y
>
> real@real:~/working_copy/nginx-systemtap-toolkit$ stap --version
> Systemtap translator/driver (version 2.3/0.152, commit
> release-2.2.1-204-g2759d5b)
> Copyright (C) 2005-2013 Red Hat, Inc. and others
> This is free software; see the source for copying conditions.
> enabled features: LIBSQLITE3 TR1_UNORDERED_MAP NLS
>
> real@real:~/working_copy/nginx-systemtap-toolkit$ sudo perl check-debug-info
> -p 14694
> [sudo] password for real:
> File /lib/i386-linux-gnu/ld-2.15.so has no debug info embedded.
> File /lib/i386-linux-gnu/libc-2.15.so has no debug info embedded.
> File /lib/i386-linux-gnu/libcrypt-2.15.so has no debug info embedded.
> File /lib/i386-linux-gnu/libdl-2.15.so has no debug info embedded.
> File /lib/i386-linux-gnu/libnsl-2.15.so has no debug info embedded.
> File /lib/i386-linux-gnu/libnss_compat-2.15.so has no debug info embedded.
> File /lib/i386-linux-gnu/libnss_files-2.15.so has no debug info embedded.
> File /lib/i386-linux-gnu/libnss_nis-2.15.so has no debug info embedded.
> File /lib/i386-linux-gnu/libpthread-2.15.so has no debug info embedded.
>
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